Method for preparing pellets from rice husk and apparatus for removing odor using rice husk pellet bio-media

Abstract

A method for preparing pellets from rice husk includes: grinding rice husk; adding ammonia water to a mixture of ethylene vinyl acetate and poly(vinylacetate) to prepare a mixed liquid binder; mixing the mixed binder with the ground rice husk to obtain a binder/rice husk mixture; extruding the binder/rice husk mixture through an extruder; and cooling the extruded mixture at room temperature.

What is claimed is: 
     
       1. A method for preparing rice husk bio-media pellets having a plurality of pores to which microorganisms are attachable, from rice husk, comprising:
 grinding rice husk; 
 adding ammonia water to a mixture of ethylene vinyl acetate and poly(vinylacetate) to dissolve the poly(vinylacetate), thereby preparing a mixed liquid binder; 
 mixing the mixed liquid binder with the ground rice husk to obtain a binder/rice husk mixture; 
 heating the binder/rice husk mixture within an extruder maintained at a temperature between 80° C. and 90° C. and extruding the heated binder/rice husk mixture, thereby forming rice husk bio-media pellets having a plurality of pores to which microorganisms are attachable, wherein the pores of the rice husk bio-media pellets are made by evaporating ammonia gas of the ammonia water through the heating; and 
 cooling the rice husk bio-media pellets at room temperature, 
 wherein microorganisms are attached to the pores of the rice husk bio-media pellets and fed by carbon components of the rice husk bio-media pellets when the ethylene vinyl acetate of the rice husk bio-media pellets absorbs an amount of water. 
 
     
     
       2. The method of  claim 1 , wherein the rice husk is ground to 1 mm or less. 
     
     
       3. The method of  claim 1 , wherein, in the adding ammonia water to a mixture of ethylene vinyl acetate and poly(vinylacetate), a mixing ratio of ethylene vinyl acetate:poly(vinylacetate):ammonia water is 1:1:0.1. 
     
     
       4. The method of  claim 1 , wherein a mixing ratio of the mixed liquid binder:the ground rice husk is 10:2.